Add Test Coverage for VFolder Database Query Functions

## Problem

VFolder records are stored in our database and can be queried based on various access control conditions:

- User id
- Project (user-group) relationship
- User role (admin, normal user, etc.)Currently, these query functions lack test coverage.
## Proposal

Implement comprehensive test cases to verify that VFolder query functions correctly filter and return data based on different access conditions.

## Additional Notes

- Document expected query behavior for each conditions
- Include examples of complex permission scenarios

JIRA Issue: BA-40